Cylinder-head for steam-engines



(No Model.)

H. TABOR.

GYEINEEE NEEDI EOE STEAM ENGINES. No. 303,070. l Patented Aug. 5, 1884.12g-f gl "(2,2 h l v i 1 lx N" m W" .f

w/ i @QW/4.41225@- Uturnn Srnrns far-snr rrici@ HARRIS TABOR, OFALLEGHENY, ASSIGNOR TO THE WESTIN G HOUSE MACHINE COMPANY, OF PITTSBURG,PENNSYLVANIA.

CYLiNnER-HEAD FOR STEAM-ENGINES.

SPECIFICATION forming part of Letters Patent No. 303,070, dated August5, 1884.

Application filed January 23, 18.84. (No model.)

To @ZZ whom t may concern:

t Beit known that I, HARRIS Tanon, a citizen of the Uni ted States,residing at Allegheny, county of Allegheny, State of Pennsylvania, haveinvented or discovered a new and useful Improvement in Cylinder-Headsfor Steam- Engines 5 and I do hereby declare the following to be a full,clear, concise, and exact description thereof, reference being had tothe accompanying drawings, nia-king a part ot' this specification, inwhich--like letters indicatin g like parts Figure 1 is a centraltransverse section through a cylinder-head embodying my invention, andFig. 2 a plan or top view of the same.

The object 'of my ninvention is to enable the relief of over-pressureinduced in the cylinder of a steam or other engine by an accumulation ofWater therein to be effected Without substantial damage to the cylinderor other members of the engine; and to this end my improvement consistsin the combination, with a cylinder-head, of a relief-plate, an outercasing, and a connecting-bolt, as hereinafter more fully set forth.

In the operation of steam-engines accidents of more or less seriouscharacter are frequently occasioned through the neglect ofthe engineerto clear thecylinder of Water which has accumulated by the condensationof steam therein andin the steam and exhaust pipes, or which has beencarried over with the steam by priming, or by reason of the Water-levelin the boiler being unduly high. In addition to the damage which theengine itself sustains, serious loss often results from the stoppageofthe machinery which it operates, and it is consequently desirable notonly to exercise all possible eiiort and precautions for the preventionof accidents of the character referred to, but also to reduce, as far asmay be, their injurious effect Where preventive measures have beenneglected or proven insuiiicient.

My invention is designed to comply with the requirement last stated byproviding a member whose capacity of resistance, While sufficient tosustain the maximum pressure which may be normally and safely exerted inthe cylinder, is so limited relatively to that of other members subjectto equal strain as to Y insure its fracture before the attainment of asufficiently high degree of pressure to effect damage to other parts,and which, when operate, and less than that which would be sufficient tocause damage to other parts in the event of breakage. The relief-platewill consequently remain intact so long as the normal Working-pressure,or any safe addition thereto, is not exceeded; but upon the exertion ofinternal pressure in excess of the limit of resistance which it isconstructed to afford it will fracture through the groove a', andrelieve such excess of pressure Without injurious effect other thancausing a brief stoppage of the engine for the insertion of na newplate. The relief-plate is connected by a bolt, u?, engaging a thread ina central'hub or boss, c3, on its outer side, to an outerplate, u",which rests on the top of the flange a5 of the cylinder-head. The iiangeand body of the head being located indii'ierent planes, a cylindricalspace is formed Within the head, on its outer side, for which the outerplate serves as a cap or cover.V The outer plate, afi,

-serves to jacket the head, as is desirable, as

Well as to present a neat external finish.

I claim herein as my invention- 1. The combination, substantially as setforth, of a cylinder-head and a relief-plate the strength of which isless than that of the head.

2. The combina-tion, substantially as set Q suaovo forth, of acylinder-head and a relief-plate flange of the head, and a boltconnecting said having its transverse section reduced by a outer platewith the hub of the relief-plate. 1o groove 0r recess. In testimonywhereof I have hereunto set 3. The combination, substantially as set myhand.

5 forth, of a cylinder-head, a grooved or reeessed relief-plate securedagainst a shoulder Witnesses: therein and having an outwardly-projectingJ. SNOWDEN BELL, hub or boss, an outer plate bearing on the Rl H.WHITTLESEY.

HARRIS TBOR.

